. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. 448 COMPOSITAE (COMPOSITE FAMILY) on the long, naked stalks near their summits; the many rays long, yellow, notched at their tips, pistillate and fertile; disk-florets orange-yellow, perfect but ster- ile ; bracts of the involucre nar- rowly ovate with long, stiff points spreading nearly as wide as the rays. The achenes, being the fruit of the ray florets, are in rings around the outer edge of the he
. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. 448 COMPOSITAE (COMPOSITE FAMILY) on the long, naked stalks near their summits; the many rays long, yellow, notched at their tips, pistillate and fertile; disk-florets orange-yellow, perfect but ster- ile ; bracts of the involucre nar- rowly ovate with long, stiff points spreading nearly as wide as the rays. The achenes, being the fruit of the ray florets, are in rings around the outer edge of the heads, each about a half- inch long, brown, flat, oval, and broadly winged, deeply notched at the top, without pappus. (Fig. 312.) Means of control Cultivation of the ground is the best method of suppres- sion; but if not desirable to break up the meadows where the plant is most troublesome, it should be cut deeply, below the crown, with a sharp hoe or spud, before the first flowers mature, the roots being salted so as to check new growth. PRAIRIE DOCK Sllphium terebinthin&ceum, Jaoq. Other English names: Rosin Plant, Prairie Burdock. Native. Perennial. Propagates by seeds. Time of bloom: July to September. Seed-time: August to October. Range: Ontario and Ohio to Minnesota, southward to Georgia and Louisiana. Habitat: Prairies and dry woods, meadows, and pastures. Terebinthine is the ancient word for turpentine, and the resin- ous juice of this and the preceding weed accounts for one of their. Fig. 312. — Compass Plant (Silphium laciniatum). X Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Georgia, Ada Eljiva, 1859-1921. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectweeds, bookyear1919
